CF-0888E

#define _CRT_SECURE_NO_WARNINGS
#define _SCL_SECURE_NO_WARNINGS

#include <iostream>
#include <iomanip>
#include <algorithm>
#include <string>
#include <vector>
#include <list>
#include <stack>
#include <queue>
#include <cstring>
#include <cstdio>
#include <map>
#include <set>
#include <bitset>
#include <cmath>

typedef long long ll;




using namespace std;


#define pb push_back
#define pp pop
#define ins insert
#define rmv remove
//#include<bits/stdc++>



int main()
{
    int n, m;
    cin >> n >> m;

    vector<int> a;
    ll opt[n + 1];


    a.push_back(0);

    for (int i = 0; i < n; i++)
    {
        ll x;
        cin >> x;
        a.pb(x%m);
    }

    opt[0] = 0;
    for (int i = 1; i <= n; i++)
    {
        opt[i] = max((opt[i - 1] + a[i]) % m, opt[i - 1]);
    }

    cout << opt[n] << endl;

    return 0;
}